Around 4 -5 months most babies begin to develop a more predictable nap schedule and by the 6th month most babies should stop taking “cat naps” and start taking longer more restorative naps. Windows of wakefulness (meaning how long they are wake between periods of sleep) are still short and often babies at this age are ready for the morning nap as soon as 1.5-2 hours after they wake up in the morning and then again 2-3 hours after they wake from their morning nap (assuming the morning nap was a reasonable length). By 9 months of age most babies have given up their 3rd late afternoon cat nap, however keep in mind if your little one is not taking 2 good naps (1.5-2 hours each) then this 3rd nap is mandatory. Once they start taking better naps your baby will start skipping this 3rd nap and go down to needing only 2 predictable and restorative naps each day.